When you buy a MPV space is a premium, not driving dynamics or body construction. When you fold away the 3rd row seat for luggage the Sienta becomes no better than a sedan car with carrying capacity for 5 people. The space behind the 3rd row seat for the Avanza looks small but really helps when you have 7 people going for overnight trips. I know because I own an Avanza and I've taken it for many such trips. So think carefully before you pay a higher price for gadgets and gizmos and some safety features but less functionality as an MPV.